The sedge Carex secalina – critically endangered species in Poland: new locality in the breeding colony of black-headed gull Chroicocephalus ridibundus

Abstract

A new locality of rye sedge Carex secalina, a critically endangered species was discovered on an island of Lake Kusowo, in the vicinity of Bydgoszcz (Kuyavian-Pomeranian Province), in June 2015. The species was found in a breeding colony of black-headed gull Chroicocephalus ridibundus. The population size was estimated at least at 30 individuals and all of them produced generative shoots. This locality of C. secalina is the northernmost in Poland and the only ascertained, apart from Inowrocław Plain. Colonization of the island by C. secalina was caused, probably, by zoochory as a result of accidental bringing of propagules by gulls, together with nesting material from outside the colony.

Endophytic fungi and latent pathogens in the sedge Carex secalina (Cyperaceae), a critically endangered species in Europe

“…In 2000, its presence was confirmed again at two historical localities, and its presence was documented in a new locality (Lembicz et al 2009). The extant populations of C. secalina occur close to each other, mainly on the regularly used pasture grounds, near small water bodies (Lembicz et al 2009;Dominiak & Jakubas 2015;Sandecki 2016). Currently, this species is considered as critically endangered in Poland (Chmiel et al 2014).…”